This is probably an unusual problem for here, as there seem to be lots of XP/Hs who just don't give a toss, so please bear with me.
My XP is the opposite and I don't quite know how to explain it without sounding like an utter idiot.
Basically, we have a 2 1/2 year old DS who I love more than I ever thought possible.
I think my XP is trying to take over full custody. Like I said above it's really hard to explain it and he is very subtle about undermining me...he is very controlling.
For example, if we go to mediation he will 'manipulate' things around so that they suit him (I'm trying to think of an example). Like I'll say 'I think we should have a more formal agreement about when DS spends time with each of us' he'll agree and then 'forget' about it., or say 'no, no, that's not what we discussed at all'. (Realise this all sounds a bit nebulous).
Anyway, if anyone can offer advice then I'd be very grateful. Thanks for taking the time to read through that mess!